Question

solve the system by substitution.
2x+y=-11
3x-4y=11
Help please! will give medal

Answer 1

ok so looking at the first one. basically you have to multiply one or both of the equations by a number so that the coefficient of one of the variables is the same so that when you subtract/add them then it will cancel.
^that sounds confusing, here's an ex for elimination:
x+y=5, 2x+y = 30
so if we multiplied the first equation by 2, we'd get: 2x+2y=10 right?
so we can subtract now...
2x+2y=10
- 2x+y=30
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0 + y = -20
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and now we can plug in -20 for y back in the equation to find x. hope that made sense

Answer 2

thank you