Thread: Linear Equation Help

Hey everybody, i really need some help quick.

Im having trouble with linear equations. If anyone can show me how to solve them that would be great.

3x + 5y = 26
2x - y = 13




x - 2y = -12
3x + 8y = 34



I also need help on these.

2x - 3y = 4
.02x + .01y = .52




Last but not least...

Terry did all 25 problems on the test and got an 85. Scores are computed by giving 4 points for each right answer and subtracting 1 point for each wrong answer. How many problems did Terry get right and wrong?

Varibles:

Equation:

Originally Posted by misfitgirl16

Hey everybody, i really need some help quick.

Im having trouble with linear equations. If anyone can show me how to solve them that would be great.

3x + 5y = 26
2x - y = 13

In second equation solve for 'y':
y=-13+2x
Subsitute into first,
3x+5(-13+2x)=26
3x-65+10x=26
13x-65=26
13x=91
x=7
Thus,
y=-13+2(7)=-13+14=1

Originally Posted by misfitgirl16

x - 2y = -12
3x + 8y = 34

In first solve for 'x':

Substitute into second,





Thus,

Thank you so much! i appreciate it